<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    /*
      1.设置计数器并初始化
      2.遍历,初始化为i=1,条件表达式i<=n,操作表达式i++
      3.通过遍历,根据给定的n得到count
      4.三目运算符完美解决,输出结果
      5.个数为3 即可
    */
    var isThree = function (n) {
      let count = 0
      for (let i = 1; i <= n; i++) {
        if (!(n % i)) {
          count++
        }
      }
      return count === 3 ? true : false
    };
    console.log(isThree(n = 4))
  </script>
</body>

</html>